Thanks for your bug report. Could you please open a terminal, and run
alsamixer. Using the left/right arrow keys, find the control labeled
"External Amplifier" it should appear to be turned on. Press the M key
to turn it off.

Once this is done, plesae check to see whether sound works.

Thanks.

** Changed in: alsa-driver (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/779351

Title:
  [ICH - SiS SI7012] ALSA test tone not correctly played back

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